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Pink urates in the droppings can be normal overnight. Reproductive problems can be common in hens that age. Egg yolk peritonitis, internal laying, and other conditions can cause weak legs, a swollen lower abdomen, loss of weight in the breast area, a penguin stance, and soft shelled or absence of eggs. Most conditions like this may not be found until a necropsy is done after death. You could try treating her for necrotic enteritis with Tylan, oxytetracycline, or another antibiotic, and then give her a course of Corid afterward, just in case there is a coccidia overload. Probiotics in her diet or a small amount of plain yogurt may help with her diarrhea. There is blood in only the worst strains of coccidiosis--some just cause chronic wasting and diarrhea. Diseases like Mareks can also cause wasting.
Edited by Eggcessive - 10/13/15 at 7:06am